Here are some ideas.

-A status-causing Alchemer can be useful for hit-and-run with a Recon Cloak. Uncloak-FIRE-cloak works wonders. I would recommend getting the Firotech or Voltech; Cryotech would be great if every Dusker Clone didn't have Freeze resistance. Don't unload the full clip; you have to reload then, and that is dangerous.
-Hit-and-run can be done with Magnus, with a little less mobility; Magnus immobilizes you while you fire, but it fires quick, dealing Piercing damage and Stun.
-Some people like Valiance in T3, and MAYBE Super Blaster will function the same way in T2. If it does, the trick is to Death Mark the target (with the Recon Cloak), then open fire with the Super Blaster. Death Mark cleans up the target's defenses, and the gun's knockback might save your life.
-If you're OK with a less popular sword, once you've Shocked a clone, you can probably hit him with a Kamarin. Its best aspect is the charge attack; Recon helps with this, having a global CTR: Medium. Its combo knocks clones back, but it's tricky to time.
-Toxic Vaporizer Mk II is all right in tandem with another weapon, but not so much on its own. It's not a damager, but a debuffer that makes a victim's attack into utter crap.
-Sun Shards is an EXCELLENT bomb for T2 Lockdown. Sends eight split Piercing/Elemental shards in different directions. It's best to use alongside other players, where enemies are distracted dealing with "the greater threat". But a solo bomber with SS can wipe out a Dusker Clone, if my T3 performance is any indication.
-Super Blast Bomb, if spammed effectively, makes the place no-man's-land. Twisted Spine Cone has no knockback, but still deals nice damage.
-Haze Bomb Mk II is dangerous to use because of a glitch that may cause someone to double attack; if they launch an attack and get stunned midway, the double attack takes effect. However, it's amazing to use in tandem with another bomber with Lightning Capacitor.
-The aforementioned Lightning Capacitor is something I used in T2 Lockdown, along with a Sealed Sword. Spamming it and staying with a group, or packing a sword to use on the side, is certainly an effective tactic, as the Shock interruption will save your skin while making them vulnerable to attack. If combined with another guy's Haze Mk II, the combination is deadly, making the guy a moving target.
-Fiery Vaporizer Mk II just... isn't that powerful. A Firotech's fire does more; FV Mk II will just annoy the clones a little while they run you through. FREEZING Vaporizer Mk II would be incredible... if Duskers didn't have so much unreasonable Freeze resist. Since when is a Voltail immune to Freeze anyway?
-As far as armor goes, you don't need a Demo Suit if you're going Recon; the cloak offers Very High CTR for Bombs, and if you've got level 10 Bombs, the CTR will reach Maximum. In T3, you'll want Bombastic or Mercurial Demo as a Recon Bomber; in T2, you don't get any of that. With a Recon Cloak, your best bet is a defensive armor (Quicksilver works well, immune to Toothpicks and Shock), or an armor that optimizes another weapon type (Gunslinger, for example, goes great with a recon Bomber). You can bomb with Guardian, but even if you have full Fused Demo, your CTR will only reach Ultra.
-If you use the Recon Cloak, DON'T BE PREDICTABLE! When you cloak, people expect you to run away. Instead, move a completely different direction: straight toward them. They'll likely be swinging at the air where you were, while you slip safely behind them.

Someone (I think it was Seiran, but I'm not so sure) made an awesome guide to Recons. Would someone link it, please?